qcrypto-luks: pass keyslot index rather that pointer to the keyslot

Another minor refactoring

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
1 file changed